Nutrient availability is just as important as Nutrient density. Depending on many factors, your digestive system may be working great or it may have weak stomach acid, low pancreatic enzymes, corrosive bile, or an imbalanced microbiome. As you get older, or if you are feeling like your body needs more support, give your digestive system the easiest food to digest and the best support for your digestive organs.
What follows is general advice about food. More potent approaches to strengthening your digestion should be done with your health care professional. There are some things you do not want to get wrong.
Another bit of food wisdom from Chinese medicine reminds us that the longer it takes a food to grow, the longer you need to cook it. Eating lettuce, other greens, and sprouts raw makes sense. Steaming turnip greens and radishes is easier to digest and more nutrient available, especially with some fat. Carrots should be boiled until they only dense in the middle. Again, bring on the fat. Leaves that can survive a frost, like Kale, collards, Chard, and large Spinach should be blanched to remove the oxalic acid.